Shown below is the mass spectrum of butan-2-ol. Identify the m/z of the fragments generated from one dehydration and two α-cleavage fragmentations.

Dehydration: 59 m/z

α-cleavage: 45 m/z and 56 m/z

Dehydration: 45 m/z

α-cleavage: 27 m/z and 31 m/z

Dehydration: 56 m/z

α-cleavage: 45 m/z and 59 m/z

Dehydration: 56 m/z

α-cleavage: 27 m/z and 59 m/z